Question

(a)

How much heat transfer (in kcal) is required to raise the temperature of a 0.550 kg aluminum pot containing 3.50 kg of water from 25.0°C to the boiling point and then boil away 0.650 kg of water?

(b)

How long (in s) does this take if the rate of heat transfer is 600 W (1 watt = 1 joule/second (1 W = 1 J/s))?

Answer #1

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.600 kg aluminum pot containing 2.00 kg of water
from 40.0°C to the boiling point and then boil away 0.850 kg of
water?
kcal
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
s

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.700 kg aluminum pot containing 1.50 kg of water
from 35.0°C to the boiling point and then boil away 0.800 kg of
water?
? kcal
(b)
How long (in s) does this take if the rate of heat transfer is
550 W (1 watt = 1 joule/second (1 W = 1 J/s))?
? s
Please explain each step thoroughly and why, I am really
confused.

(a) How much heat transfer is required to raise the temperature
of a 0.750-kg copper pot containing 2.50 kg of water from 30.0ºC to
the boiling point and then boil away 0.750 kg of water?
(b) How long does this take if the rate of heat transfer is 555
W 1 watt = 1 joule/second (1 W = 1 J/s) ? Answer in seconds.

How much heat transfer (in kJ) is necessary to raise the
temperature of 0.766 kg of ice from 0ºC to 32.6ºC? The specific
heat of water is 4186 J/kgºC and the heat of fusion for water is
334 kJ/kg.

How much time (in seconds) is needed for a surgical cauterizer
to raise the temperature of 2.00 g of tissue from 37.0°C to 100°C
and then boil away 0.200 g of water, if it puts out 1.50 mA at 20.0
kV? Ignore heat transfer to the surroundings. (Assume the specific
heat of tissue is 3,500 J/(kg · °C) and the latent heat of
vaporization of water is 2,256 kJ/kg.)

(a) How much energy is needed to raise 1.00 kg of liquid water
from 19.9 ?C to 99.9 ?C? (b) How much energy is needed to evaporate
1.00 kg of liquid water (at 100?C) into steam (at 100?C)? Be
careful not to confuse J with kJ. (c) Is the relative size of these
two numbers consistent with everyday experience that it takes much
longer (e.g. maybe an hour or so) to boil away an entire pot of
water than it...

How much heat transfer in kJ is necessary to raise the
temperature of a 0.347 kg piece of ice from -12.6ºC to 132.1ºC ,
including the energy needed for phase changes? (cice = 2090 J/kgºC,
cwater = 4186 J/kgºC, csteam = 1520 J/kg, Lvap = 2256 kJ/kg, and
Lfus = 334 kJ/kg)

1A: How many calories will it take to raise the
temperature of a 39 g gold chain from 20°C to 110°C?
_________ cal
1B: How many calories would it take to raise the
temperature of a 415 g aluminum pan from 293 K to 384
K?
_________ cal
1C: 75 grams of water at 90°C are mixed with an equal
amount of water at 10°C in a completely insulated container. The
final temperature of the water is 50°C.
(a) How...

(a) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of water.
(b) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of iron.

(a)
How much heat transfer (in kJ) is necessary to raise the
temperature of a 0.210 kg piece of ice from −24.0°C to 134°C,
including the energy needed for phase changes? (Assume the
substance remains at a constant volume throughout each stage of the
heating process.)
kJ
(b)
How much time (in s) is required for each stage, assuming a
constant 20.5 kJ/s rate of heat transfer? (Enter your answers as a
comma-separated list. Enter your times in order from...

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